30. The molar heat of vaporization of phosphine is 14.6 kJ/mol and phosphine’s boiling point is –87.7oC. Calculate the entropy change for vaporization.

33. Use the standard free energy of formation data in Appendix G to determine the free energy change for each of the following reactions, which are run under standard state conditions and 25 °C. Identify each as either spontaneous or nonspontaneous at these conditions. MnO2 (s) ⟶ Mn(s) + O2 (g) H2 (g) + Br2 (l) ⟶ 2HBr(g) Cu(s) + S(g) ⟶ CuS(s) 2LiOH(s) + CO2 (g) ⟶ Li2CO3 (s) + H2O(g) CH4 (g) + O2 (g) ⟶ C(s, graphite) + 2H2O(g) CS2 (g) + 3Cl2 (g) ⟶ CCl4(g) + S2Cl2 (g)

Consider the two different systems, A and B, shown below.  If there are 3 particles with a total energy of 12 J, which system would have more entropy and why? Question 21 options:   System A has more entropy because it has greater separation between energy levels and hence more microstates than system B.   System B has more entropy because it has more than two microstates, whereas System A only has two microstates possible.   System A has more entropy because it has three microstates, whereas System B has less than three microstates possible.   System B has more entropy because it has more than three microstates, whereas System A only has three microstates possible.   System A has more entropy because it has more than one microstate, whereas System B only has one microstate possible.

Use standard thermodynamic data to calculate G at 298.15 K for the following reaction, assuming that all gases have a pressure of 20.46 mm Hg.2NO(g) + O2(g)2NO2(g)  G =  ______kJ/mol

Give answer all questions with explanation please

HI has a normal boiling point of –35.4°C, and its DHvapis 21.16 kJ/mol. Calculate the molar entropy of vaporization (DSvap).  Be sure to include the correct units with your answer.

Calculate the change in entropy when the pressure of a 55.0 g sample of oxygen gas is increased from 625 mmHg to 1.24 atm at a constant temperature of 25°C. Assume ideal behavior.

1.Provide an explanation for  why  B2H6(g) /BH3(g) spontaneously reacts and ignites in air , but  CH4 (g) persists in the presence of air indefinitely. 2.The standard state for elementary antimony is the tetrameric  molecular solid ( Sb4(s)) .    The standard enthalpies of vaporization and atomization for one gram atom (121.76g)  of elemental antimony   are 68 kj and 264 kj  per mole of antimony atoms respectively . What is the average effective   Sb-Sb bond dissociation enthalpy  for the standard state of antimony .